Javascript如何下载图像blob数据：image/png；base64

我的页面上显示了一幅由WaterMarkJs库生成的图像

形象 数据：图像/png；基础64，IVBORW0KGGOAAAANQKCBAWQIECBAYAABGT5AEQ2BAECBAGIDOAAECBAGMICDQBYIIIRAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGG0M0BAGQIAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQEAGQ

HTML

当显示电子邮件时，上面的html工作得很好。我怎样才能制作一个下载图像的按钮

我的尝试

不允许将顶部框架导航到数据URL

---

添加了下载属性

<a download="impeach.png" href="data:image/png;base64,iVBKCbAwQIECBAYAAB...">Download</a>

<a href="data:image/png;base64,iVB....">Download</a>

<a download="impeach.png" href="data:image/png;base64,iVBKCbAwQIECBAYAAB...">Download</a>